This doc is pretty good! I can fill in any details if you have questions, I basically followed this but on my drive, without any specific Mitsu tools.
I think he said earlier he was going to try to renumber it ? It looks like he has a MUT-III so if it is possible to reprogram the boards then he may well be the first person to attempt this and confirm whether it is possible...Or will you replace the board and attempt a renumbering/programming procedure via MUT.
Just to remind myself of all the excellent advice that Simon has provided, is to trial connect the battery, positioned sideways, via the data cables only and don't advance the key to ready.I think he said earlier he was going to try to renumber it ? It looks like he has a MUT-III so if it is possible to reprogram the boards then he may well be the first person to attempt this and confirm whether it is possible...
If it is successful that's a minor breakthrough because it would mean that providing you have the dealer diagnostic tool (MUT-III or Diagbox/Lexia 3 as applicable) then you could simply install any CMU board without having to worry about which position it came from or attempt elaborate and risky chip swaps. (Ether LTC or EEPROM)
Awaiting the results with interest.
One thing I would suggest to Martin to help verify whether renumbering really works (and that it's not just luck to get the right CMU board) is after installation first check all the individual cell voltages in MUT-III and/or Canion - if the CMU board is numbered wrong it will clash with another CMU, causing one bank of 8 cells to register invalid voltages, and a second bank may misread. (Two different banks will be broadcasting their cell voltages with the same source address - this may cause the figures to fluctute)
Then perform the action you think will renumber the cells and check all the voltages again. If there seems to be more than one procedure that might potentially renumber the cells, I would try them one at a time and recheck cell voltages in between so we can learn precisely which procedure triggers a renumber.
Assuming the battery replacement procedure has to be done to trigger a renumber be aware that the battery capacity calibration routine will need to be performed afterwards as the Ah capacity will be reset to the factory default of 45.8Ah. It would be interesting to see what your reported Ah capacity is before performing any procedures and also at the very end after the calibration process. They should be within about 2Ah of each other and initially after the calibration it may read slightly lower than before. (But this will change after some driving)
I can't claim credit for that one - that was one of Ruperts ideas...Just to remind myself of all the excellent advice that Simon has provided, is to trial connect the battery, positioned sideways, via the data cables only and don't advance the key to ready.
I can't find any mention of P1A9F for the i-Miev however I did find that fault code for the Outlander and it looks like it applies:A few new DTCs have appeared (and no sign of the old ones) but when cleared using ‘Erase DTCs’…
View attachment 130603
No idea what U1937 is but probably relates to the 2nd PCB that the one I replaced was plugged into still being the original one? The P1A9F code I assume is the system recording that CMU05 was renamed (but not what it was before).
This a tough call to make as you only really have one snapshot - cell voltages at an approximate 77% SoC.
You will definitely need HV cables connected to do the battery calibration. As to how you initiate it on MUT-III I don't know sorry. The procedure actually differs between different versions of Diagbox let alone between Diagbox and MUT-III.Next question is the battery capacity measuring proceedure... You can see from the BMU Special Function screen (way above) there are 2 options 'Ready' and 'Action'. I'm wondering if these are the same as the Diagbox's 2 stages to do the same thing? If I remember right from another thread, there is a preperation stage and then the actual test. I will, of course have to reconnect at least the right side HV cables and the Service Plug but also the other HV cables? Probably not.